CVS commit: src/sys/arch/i386/i386

[Matthias Drochner <drochner%netbsd.org@localhost>]

Module Name:    src
Committed By:   drochner
Date:           Sun Feb 14 11:09:54 UTC 2010

Modified Files:
        src/sys/arch/i386/i386: ibcs2_machdep.c svr4_machdep.c

Log Message:
fix confused CS selector, fixes the panic reported by Mark Davis
per PR port-i386/42787 (the panic happens due to a GPF when a
privileged descriptor is tried to be loaded with the UPL bit set)
The original bug is very old (pre-2.0, i386/svr4_machdep.c rev. 1.69),
but it was relatively harmless until the order of GDT entries was
shuffled (pre-5.0, i386/segments.h rev. 1.42). Before, it caused
a userlevel data selector to be used for CS which broke the emulation
(likely the reason of PR port-i386/32424). The shuffle made that
a privileged selector was used, causing the GPF.
(recent -current doesn't panic on that GPF which seems to be a
side effect of another change)


To generate a diff of this commit:
cvs rdiff -u -r1.39 -r1.40 src/sys/arch/i386/i386/ibcs2_machdep.c
cvs rdiff -u -r1.95 -r1.96 src/sys/arch/i386/i386/svr4_machdep.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.